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Can LM5020 be used in an offline AC/DC converter?

April 26, 2017AC converter dc lm5020 offline Used

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Can LM5020 be used in an offline AC/DC converter?

1 Answer

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10 Posted

Yes. An external shunt regulator can be used to drop the rectified 400V DC line down to 15V DC input for a start-up regulator in the LM5020 controller. Shortly after the AC/DC converter is up and running, an auxiliary feedback winding off the transformer will provide VCC voltage to the LM5020, which shuts off the startup regulator and eliminates the load on the external shunt regulator.